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Maxnet No Picture

Audio OK Video Verticle color Lines Only.
screen bright no pixel problems.

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techman
  • 3130 Answers

SOURCE: Top of screen is stretched

There are capacitors in the vertical circuit that can cause this problem. You may be able to find these capacitors by using a hair dryer pointed to the suspected bad cap and then when the problem happens you can spry a little cooling spray on it to see if the problem clears up. The vertical output IC could be going bad but this can be checked the same way. if you have no TV solid state repair experience, play it safe and take this set into a local repair depot. Good Luck

Posted on Mar 17, 2007

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2 Answers

The tv keeps losing color


Hello,

The remaining red retrace are the giveaway that this is most likely not a CRT problem.

(If there were no red lines, it could be the filament for the red gun of the CRT going on and off due to a bad connection inside the CRT - bad news.)

How is a black and white picture? (Turn down the color control).

If B/W picture is good, then the problem is somewhere back in the chroma decoder circuitry.

Check the video input to the CRT video driver board and signals on that board. If B/W picture is also bad, then you can compare red and green signals to determine where they are becoming different. The red lines in your description sounds like the red video output circuit is drifting and messing up the background level, blanking, screen, or other setting. Could be a capacitor or other component.
Hope this will help...

Jun 01, 2010 | Polaroid TBX-2000AF 20 in. TV/VCR/DVD...

5 Answers

Losing color


You can try a hard reset: Unplug TV from AC mains and remove all cables from TV. Wait about 30 minutes and replug to AC power and redo the cabling. Switch on the TV and see if it works..And check if your facing when playing DVD ...

Oct 15, 2008 | Sylvania 6719DC 19 in. TV/VCR/DVD Combo

1 Answer

I hear audio but the screen is black.


Hi,

If everything else works - there is sound and high voltage (static on the screen) - but there is no picture (including no on-screen menus), this limits the likely area of problems is the video output circuitry or CRT filament connections. Check to see if the CRT filaments are glowing. If they are not glowing, check for bad soldering on the CRT neck board and around the flyback transformer.

Where the picture is erratic - coming and going entirely or changing brightness suddenly, with power off, remove the picture tube socket (carefully!) and clean the pins with fine sandpaper and use contact cleaner on the socket. This source of bad connections can result in a variety of erratic symptoms. Check for bad solder connections on the CRT neck board.
Hope this will help...

Jun 01, 2010 | Emerson EWC1304 13 in. TV/VCR Combo

1 Answer

The screen has narrow white lines across the top 3 inches, on cable and with a VCR Tape in.


hello,
Where all colors are involved - the lines are essentially white or gray (or with a slight tint due to slight unequal settings of the color adjustments), look for something common like an incorrectly adjusted screen (G2) or master brightness/background/bias control or a problem in one of these circuits, a defective power supply or a problem in the blanking circuitry:

Screen (G2) or master brightness/background/bias control - mark setting and then see if a slight adjustment removes the retrace lines. See the chapter: "TV Adjustments". Of course, if this happened suddenly, the problem is not due to a misadjusted control though a dirty pot is possible - turn it back and forth - this might clean it and restore normal operation.

Power supply or connection to CRT neck board - insufficient voltage will result in the CRT never totally blanking. Check (usually scan derived) power supply components (from flyback).

General power supply - check B+ for correct value and ripple. A main power supply fault might result in these symptoms (and usually many others).

Blanking circuit - this may be a part of the video/chroma chip or separate. Check waveforms to determine if the blanking pulses are making it to the video output.

May 28, 2010 | Toshiba MV13L2 13 in. TV/VCR Combo

1 Answer

No Picture


check out the tip in my profile or use a wet cleaning tape

Mar 31, 2008 | GE 13TVR62 Combo

1 Answer

Top of screen is stretched


There are capacitors in the vertical circuit that can cause this problem. You may be able to find these capacitors by using a hair dryer pointed to the suspected bad cap and then when the problem happens you can spry a little cooling spray on it to see if the problem clears up. The vertical output IC could be going bad but this can be checked the same way. if you have no TV solid state repair experience, play it safe and take this set into a local repair depot. Good Luck

Mar 17, 2007 | Toshiba MW24FN1 24 in. TV/VCR/DVD Combo

3 Answers

No picture


If the screen is completely black, do you feel static from the screen? If not then you probably lost your High voltage to light up the screen. If you do feel static, and in a darkened room can see a gray screen, then you have lost your video signal internally, and it could be anything from a video IC to the microcontroller chip which would be an expensive repair. Since you see some pixels in the middle of the screen when the TV is off, I'll assume the High voltage is good, and besides the video circuits, it's possible that if you had a defect in the vertical sweep circuits, it might kill the video as well. May want to get an estimate or if it's over 8 years old, replace it.

Dec 19, 2006 | Panasonic PV-DF2704 27 in. TV/VCR/DVD...

2 Answers

LOSS OF T.V. PICTURE


My television has sound but no picture. I can not program the television because I can not see the screen menu. I also have tried to change the antennae but this does nothing to the picture's reception.

Do you have any ideas to correct this problem. There is no warranty.

Apr 11, 2006 | Toshiba MW24FM1 24 in. TV/VCR/DVD Combo

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